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Geronimo is a Java EE 5 application server which is developed by the Apache Software Foundation and it is under the Apache Software License 2.0.

CHARVA is a Java framework for presenting a "graphical" user interface, composed of elements such as windows, dialogs, menus, textfields and buttons, on a traditional character-cell ASCII terminal. It has an API based on that of "Swing" (a.k.a. the Java Foundation Classes).

DrJava is a lightweight development environment for writing Java programs. It is designed primarily for students, providing an intuitive interface and the ability to interactively evaluate Java code. It also includes powerful features for more advanced users. DrJava is available for free under the DrJava Open Source License, and it is under active development by the JavaPLT group at Rice University.

JTransforms is the first, open source, multithreaded FFT library written in pure Java. Currently, four types of transforms are available: Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT), Discrete Sine Transform (DST) and Discrete Hartley Transform (DHT). The code is derived from General Purpose FFT Package written by Takuya Ooura and from Java FFTPack written by Baoshe Zhang.

Pauker is a Java program for flashcard learning based on the Leitner system.

XStream is a simple library to serialize Java objects to XML and back again.

dnsjava is an implementation of DNS in Java. It supports all defined record types (including the DNSSEC types), and unknown types. It can be used for queries, zone transfers, and dynamic updates. It includes a cache which can be used by clients, and a minimal implementation of a server. It supports TSIG authenticated messages, partial DNSSEC verification, and EDNS0. dnsjava provides functionality above and beyond that of the InetAddress class. Since it is written in pure Java, dnsjava is fully threadable, and in many cases is faster than using InetAddress. dnsjava provides both high and low level access to DNS. The high level functions perform queries for records of a given name, type, and class, and return an array of records. There is also a clone of InetAddress, which is even simpler. A cache is used to reduce the number of DNS queries sent. The low level functions allow direct manipulation of DNS messages and records, as well as allowing additional resolver properties to be set.

JIIC is a Java-based implementation for creating CD-ROM filesystem images according to ISO 9660, also known as ECMA-119. It provides support for the El Torito, Joliet and Rock Ridge extensions.

OmegaT is a free translation memory application written in Java. It does not translate for you, but help you during the translation process. This tool is intended for professional translators.

JRuby is a 100% Java implementation of the Ruby programming language. It is Ruby for the JVM, offering high performance, real threading and support for vast array of libraries. JRuby is highly compatible with Ruby 1.8.7 & 1.9.2 (both versions in single install).